/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets;

import com.restfb.DefaultFacebookClient;
import com.restfb.FacebookClient;
import com.restfb.types.User;
import ejb.FBuserManager;
import facebook.Utilities;
import java.io.IOException;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Antonio.. ma fa casino!
 */
@WebServlet(name = "StoreUserServlet", urlPatterns = {"/StoreUserServlet"})
public class StoreUserServlet extends HttpServlet {

    @EJB
    private FBuserManager fbUsrMngr;

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        try {
            String userId = request.getParameter("user_id");
            String accessToken = request.getParameter("access_token");
            
            if (fbUsrMngr.isNewUser(userId)) {
                FacebookClient facebookClient = new DefaultFacebookClient(accessToken);
                User user = facebookClient.fetchObject(userId, User.class);
                String userLocation = "";
                // la location può dare errore
                try {
                    userLocation = user.getLocation().getName();
                } catch (Exception e) {
                    System.err.println("errore location!");
                }
                
                fbUsrMngr.addFBuser(userId, user.getName(), accessToken, userLocation);
                
                System.out.println("New user stored"); //Use a logger!
            } 
        } catch (NullPointerException npe) {
            System.err.println("NullPointerException while storing user."); //use logger
            response.sendRedirect(Utilities.getBaseUrl(request));
        }

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
